How to add DKIM to a netqmail server...?

A few years ago I set up one netqmail server to handle DKIM, following
instructions that referenced libdomainkeys - either this page or something
similar:
http://www.lincolnritter.com/blog/2008/02/27/setting-up-dkim-and-domainkeys-email-signing-with-qmail/

Many moons have passed since then. :)  Is there a handy-dandy guide for
adding DKIM to another netqmail server, one that may be more up-to-date
preferably without having to add a patch and recompiling?

--hobie